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JavaScript The Solution

Dou Sun
Dou Sun
2,754 Points

I set the message different, it might be easier?

// 1. Attach this file -- math.js -- to the index.html file using a <script> tag

// 2. Add an alert to announce the program with a message like "Let's do some math!"

alert ("Let's do some math!");

// 3. Create a variable and use the prompt() method to collect a number from a visitor

let number1 = prompt("Please choose a number.");

// 4. Convert that value from a string to a floating point number

number1 = parseFloat(number1);

// 5. Repeat steps 3 and 4 to create a second variable and collect a second number

let number2 = prompt("Please choose another number"); number2 = parseFloat(number2);

// 6. Create a new variable -- message -- which you'll use to build // a complete message to print to the document // Start by creating a string that includes <h1> tags as well // and the two input numbers. The string should look something like this: // "<h1>Math with the numbers 3 and 4</h1>" where the two numbers are // the values input from the user. Use string concatenation to create this // and make sure you actually perform the math on the values by // using the + symbol to add their values together

let message = <h1>Math with the number ${number1} and ${number2}</h2> <p>${number1} + ${number2} = ${number1 + number2}</p> <p>${number1} * ${number2} = ${number1 * number2}</p> <p>${number1} / ${number2} = ${number1 / number2}</p> <p>${number1} - ${number2} = ${number1 - number2}</p>

// 7. Add another string to the message variable. // The string should look something like this after concatenation: // "3 + 4 = 7"

// 8. Add a linebreak tag -- <br> -- to the message variable

// 9. Continue to add to the message variable to include strings // demonstrating multiplication, division and subtraction // For example: // "3 * 4 = 12" // "3 / 4 = 0.75" // "3 - 4 = -1"

// 10. Use the document.write() method to print the message variable // to the web page. Open the finished.png file in this workspace // to see what the completed output should look like

document.write(message);

1 Answer

Steven Parker
Steven Parker
229,920 Points

Template strings can make things a bit easier to read. They can also span multiple lines, so you could take advantage of that as well to improve readability even further:

let message = `<h1>Math with the number ${number1} and ${number2}</h2>
               ${number1} + ${number2} = ${number1 + number2}<br>
               ${number1} * ${number2} = ${number1 * number2}<br>
               ${number1} / ${number2} = ${number1 / number2}<br>
               ${number1} - ${number2} = ${number1 - number2}<br>`;

Note that this example will look exactly like the video. You might prefer the look of paragraphs, but it's not consistent with the challenge instructions.